JP-7855491-B2 - power supply
Inventors
- 村西 充
Assignees
- ニチコン株式会社
Dates
- Publication Date
- 20260508
- Application Date
- 20221031
Claims (1)
- In a power supply device that converts an AC voltage supplied from an AC power source into a DC voltage and uses the DC voltage to drive an inductive load, A DC conversion unit that rectifies the AC voltage using a rectifier diode and smooths it with a capacitor, A power factor correction unit that takes the applied voltage applied to the capacitor as the input voltage and improves the power factor, The system includes a control unit that controls the power factor correction operation by the power factor correction unit based on a target output voltage, which is a target value of the output voltage of the power factor correction unit, and the input voltage. The regenerative voltage from the inductive load is regenerated to the capacitor. When the regenerative voltage is greater than the output voltage of the DC conversion unit, The control unit is a power supply device that performs control to start the power factor correction operation when the regenerative voltage is less than the target output voltage, and to stop the power factor correction operation when the regenerative voltage is equal to or greater than the target output voltage .
Description
This invention relates to a power supply device. In recent years, industrial robots that operate arms and other parts by controlling the rotation and stopping of motors have become widely used. When a motor mounted on such an industrial robot is controlled to decelerate or stop, regenerative power is generated due to the motor's inertial rotation, etc. This generated power is returned to the motor drive power supply unit, which may cause the voltage of the motor drive power supply unit to rise. If the voltage of the motor drive power supply unit rose above a certain value, the motor drive power supply unit would detect this as an abnormal voltage and stop operation to protect the circuit. Therefore, a technology has been proposed to suppress the voltage rise in the motor drive power supply by providing a regenerative power discharge resistor in the motor drive power supply and discharging the generated regenerative power through the regenerative power discharge resistor as heat (see, for example, Patent Document 1). Japanese Patent Publication No. 2020-195209 This is a configuration diagram of a power supply device according to an embodiment of the present invention.This figure shows the circuit configuration of a power supply device according to an embodiment of the present invention.This figure shows the input voltage to the power factor correction unit of the power supply device according to an embodiment of the present invention, and the operation of the control unit.This diagram shows the flow of the control unit of the power supply device according to an embodiment of the present invention. <Implementation> The power supply device 1 according to this embodiment will be described with reference to Figures 1 to 4. <Configuration of Power Supply Unit 1> As shown in Figure 1, the power supply device 1 according to this embodiment is configured to include a DC conversion unit 10, a power factor correction unit 20, a DC/DC converter unit 30, and a control unit 40. The output of the power supply unit 1 is supplied to the motor drive unit 100. Further details of the motor drive unit 100 will be described later. (Configuration of the DC conversion unit 10) The DC conversion unit 10 rectifies the AC voltage using a rectifier diode and smooths it using a capacitor. Specifically, the AC voltage supplied from the AC power source is full-wave rectified, and the resulting voltage is smoothed to convert it into a DC voltage. As shown in Figure 2, the DC conversion unit 10 is composed of rectifier diodes 11 to 14 and a capacitor 15. One end of the AC power supply is connected to the anode electrode of rectifier diode 11 and the cathode electrode of rectifier diode 12, and the other end of the AC power supply is connected to the anode electrode of rectifier diode 13 and the cathode electrode of rectifier diode 14. The cathode electrode of rectifier diode 11 is connected to the cathode electrode of rectifier diode 13. Furthermore, the anode electrode of rectifier diode 12 and the anode electrode of rectifier diode 14 are connected to ground. In other words, a bridge circuit is formed by rectifier diodes 11 to 14, and the AC voltage supplied from the AC power supply is full-wave rectified. Furthermore, the DC conversion unit 10 is supplied with power from an AC power source, for example, at an AC voltage of 200V. One end of the capacitor 15 is connected to the cathode electrode of the rectifier diode 11 and the cathode electrode of the rectifier diode 13, and the other end of the capacitor 15 is connected to ground. In other words, the voltage rectified by full wave in the bridge circuit described above is smoothed and converted into a DC voltage by being connected to the capacitor 15. For example, a film capacitor can be used for capacitor 15. The output voltage of the DC conversion unit 10, which has been converted to a DC voltage, is input to the power factor correction unit 20. (Configuration of the power factor correction unit 20) The power factor correction unit 20 is connected to the output side of the DC conversion unit 10 and takes the applied voltage applied to the capacitor 15 as its input voltage to improve the power factor. The power factor correction unit 20 is composed of a boost-type switching power supply. The power factor correction unit 20 boosts the input voltage Va applied to the capacitor 15 of the DC conversion unit 10 to the target output voltage Vt. As shown in Figure 2, the power factor correction unit 20 is configured to include at least a coil 21, a diode 22, a transistor 23, and a capacitor 24. One end of the coil 21 is connected to one end of the capacitor 15 of the DC conversion unit 10, and the other end of the coil 21 is connected to the anode electrode of the diode 22 and the drain electrode of the transistor 23. The source electrode of transistor 23 is connected to ground, and the gate electrode of transistor 23 is connected to the control unit 40, which will be described later. Here, a